2015/05/07 by Juan F. Sierra, J. F. Sierra, I. Neumann +5
Materials Science · Physics and Astronomy · #Advanced Thermoelectric Materials and Devices #Charge carrier #Composite material #Condensed matter physics #Diffusion #Electrical engineering #Electrical resistivity and conductivity #Graphene #Graphene research and applications #Joule (programming language) #Joule heating #Materials science #Nanotechnology #Optoelectronics #Physics #Power (physics) #Seebeck coefficient #Thermal conductivity #Thermal properties of materials #Thermodynamics #Thermoelectric effect #cond-mat.mes-hall
paper · pdf · doi:10.1021/acs.nanolett.5b00922
published as Nano Letters, pp 4000-4005, 15 (2015)
openalex publication_date 2015/05/07 · arxiv created 2015/06/15 · arxiv updated 2015/06/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We investigate hot carrier propagation across graphene using an electrical nonlocal injection/detection method. The device consists of a monolayer graphene flake contacted by multiple metal leads. Using two remote leads for electrical heating, we generate a carrier temperature gradient that results in a measurable thermoelectric voltage V(NL) across the remaining (detector) leads. Due to the nonlocal character of the measurement, V(NL) is exclusively due to the Seebeck effect. Remarkably, a departure from the ordinary relationship between Joule power P and V(NL), V(NL) ∼ P, becomes readily apparent at low temperatures, representing a fingerprint of hot-carrier dominated thermoelectricity. By studying V(NL) as a function of bias, we directly determine the carrier temperature and the characteristic cooling length for hot-carrier propagation, which are key parameters for a variety of new applications that rely on hot-carrier transport.